<?php if(!empty($list_email)):?>
    <?php foreach($list_email as $k=>$v):?>                       
        <li class="mail_<?php echo $v['Node']['id'];?>"><input type="checkbox" onclick="add_mail_user('<?php echo $v['Node']['field_email'];?>','<?php echo $v['Node']['id'];?>');" value="<?php echo $v['Node']['field_email'];?>" class="_lst_email_<?php echo $v['Node']['id'];?>"> <?php echo $v['Node']['field_email'];?></li>                                
    <?php endforeach;?>
<?php endif;?>